add to cart disappeared

[Pessina-Jewelry]

Hello, the add to cart button had been working fine, however, after adding several new products, it is no longer showing on any of product pages. Any idea on what may have happened? 

I Already did this:

Add this css at the bottom of
Online Store->Theme->Edit code->Assets->custom.css

#shopify_add_to_cart {
    display: block !important;
}

But it did not help...

[Sandor]

Hello Pessina-Jewelry,

do you use Custom HTML for the added products? If so, check your HTML, I think it will no longer be valid.